Helicopter Sikorsky HR2S-1 Serial 56-106 Register 145868 used by US Marine Corps USMC. Built 1958. Aircraft history and location Aircraft History 145868 US Marine Corps 1958-10-31Sikorsky S-56, c/n 56-106, ff:? del USMC as HR2S-1, 145868, 31Oct58 w/o unk. w/o 3nov58 Send Updates Use APP to upload photo @ (optional) When Now? / / Send